Abstract vs Interface


In the last tutorials two tutorials, we learned about abstract class and interface. In this tutorial, we will learn what is the difference between Abstract class and Interface.

Abstract class Interface
An abstract class can have both abstract and non-abstract methods. But an Interface can have only abstract methods.
We can not perform multiple inheritances in the abstract class. But in the case of Interface we can perform multiple inheritance.
An Abstract class can have both final or non-final and static or non-static variables. But Interface can has only static and final variables.
An abstract class can have class members like private, protected, etc. But in case of interface all members are public by default.
We can implement an interface in an abstract class. But in an Interface can’t implement an abstract class.
The abstract keyword is used to declare an abstract class. The interface keyword is used to declare an interface.
To inherit the abstract class in our class we use “extends” keyword. To inherit in interface in our class we use “implements” keyword.


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